Income Taxes - Effective Income Tax Rate Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities		$ 3.7	$ 1.2
Income tax benefit of goodwill impairment loss		85.0
Foreign Tax Authority [Member]
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities		$ 20.0
Transition tax [Member]
Other Tax Expense (Benefit)	$ (9.3)